Company Dynamics
05-08
What are the performance of ptfe teflon spring tube
Teflon is what material? When we learn chemistry, we have learned polytetrafluoroethylene, molecular formula: C2F4, tetrafluoroethylene is mainly made of chloroform, can also be made of tetrafluorodichloroethane in the presence of chlorine trifluoride catalytic dechlorination. It is a colorless and odorless gas at normal temperature, with a boiling point of -76.3 ℃, which can be liquefied under pressure, with a critical temperature of 33.3 ℃ and a critical pressure of 3.92MPa.
05-08
Introduction and specification of PVDF tube
PVDF tube (polyvinylidene fluoride tube), closely arranged between molecular chains, strong hydrogen bonds, natural flame resistance, crystallinity of 65% ~ 78%, long-term use temperature -40~150 ℃. Its outstanding features are high mechanical strength, good radiation resistance, and can be used outdoors for a long time without maintenance. It has good chemical stability and is not corroded by acid, alkali, strong oxidant and halogen at room temperature. It is widely used in petrochemical, electronic and electrical, steel pickling, and acid-base transportation.
05-08
Ptfe hose
Ptfe hose has excellent chemical stability, corrosion resistance, self-lubricating non-stick, electrical insulation and excellent aging resistance. It is usually used to transport strong corrosive media at high temperatures.
05-08
What is the material of Ptfe?
The Chinese name of PTFE is polytetrafluoroethylene. ptfe emulsion is a polymer chemical material containing polyfluorotetraethylene. It is widely used in packaging, electronic and electrical, chemical energy, corrosion-resistant materials. Teflon high-performance special coating is a fluorine coating with polytetrafluoroethylene as matrix resin. The English name is Teflon. Because of pronunciation, it is usually called Teflon, Teflon, Teflon, etc. (all translated by Teflon).
05-07
Popular Science | Processing of Meltable Polytetrafluoroethylene (PFA)
什么是PFA?
PFA的英文名称为:Polyfluoroalkoxy,中文名称为:四氟乙烯—全氟烷氧基乙烯基醚共聚物 (又称:过氟烷基化物,可溶性聚四氟乙烯) 。PFA树脂相对来说是比较新的可熔融加工的氟塑料,PFA 、FEP、PTFE 的化学性能相似,但FEP只能在200度以下使用,PTFE不能注塑。
聚四氟乙烯(PTFE),俗称“塑料王”,具有卓越的耐化学品性、耐高温性、低介电常数、不燃性、耐候性、低摩擦系数、不粘和自润滑性等特点,但PTFE熔融后难以流动,只能采用烧结方式成型,限制了加工手段和制品设计灵活性。采用少量全氟烷基乙烯基醚(PAVE)与TFE共聚生成的PFA,几乎完全保留了PTFE的优良物性,具有和PTFE相似的耐化学品性能和长期工作温度等,同时又具有良好的熔融加工性能,使制品具有极低的表面粗糙度等优点,拓展了PTFE的应用潜力。
PFA除了可以采用挤出和模压工艺外,还可以采用注射、传递模、滚塑、浸涂、喷涂等加工工艺,可以制成线缆、管、片、膜、涂层及其他复杂形状的制品,用途几乎涵盖PTFE所涉领域。
PFA的成型与加工
PFA树脂产品主要有乳液、粉料、粒料等形态,目前国内的产品主要以粒料为主,如巨化氟聚合物事业部已形成2kt/a的PFA粒料产能。PFA的熔点在290~312℃,熔指在0.8-30g/10min范围内,成型温度在350~410℃之间,模压成型、挤出成型、注射成型等常规工艺均可用于PFA树脂加工,不同批号产品的应用范围如下表(表1.1)所示。
PFA模压成型
当PFA产品的熔指在0.8~3.0g/10min范围内时,分子量比较高,粘度大,不容易流动,一般适用于使用模压成型的方式进行加工。模压成型温度为330~380℃,压力5.0~14.0MPa,在成型温度下保持20~30min,然后在压力下缓慢冷却熔体至200~240℃方可脱模。在设计模具的时候应考虑到PFA熔体粘度高、临界剪切速率低和成型温度高的特点。
PFA挤出成型
当PFA产品的熔指大于3.0g/10min时,可以采用挤出成型的方式进行加工,主要生产管材、线缆绝缘层、薄膜等。用于PFA挤出成型的螺杆长径比一般为20:1,挤出温度通常控制在330~425℃,转速设置为3~50r/min。由于PFA产品的熔体粘度较高,在挤出成型时有较高的拉伸比,可以快速得到光滑的挤出物。
PFA挤出成型的工艺和设备可以与聚全氟乙丙烯(FEP)的工艺和设备通用,但成型温度需要进一步提高。PFA也存在发生熔体破裂的临界剪切速率,高速挤出型PFA的临界剪切速率为50s-1,低速挤出或模压型型PFA的临界剪切速率为3s-1。PFA的熔体强度大,比FEP的熔体伸长率大,在成型细管和单丝时可采用更大的拉伸比。
PFA注射成型
当PFA产品的熔指在16~30g/10min范围内,且需要生产各种复杂形状的航空、航天工业、电子电气工业零件,医学、化学试验器具等时,可用PFA以普通的螺杆注塑机进行加工成型。常用塑化能力较强的螺杆挤出机,其混炼物料均匀、滞料少,对模具传递应力快,但是与PFA熔融树脂接触的螺杆、机筒和模具等均需要用耐腐蚀的不锈钢制作,并使用大口径的注入口、流道和浇注口,并且流道要尽可能短、无任何障碍和尖锐的拐角,最好是能与浇口混成一体的圆形流道,模腔内所有的角和交叉点也都是圆的或流线型的,使熔融树脂呈流线型流动。采取这些措施,并控制好熔融物的温度,可避免成型物表面或内部产生熔体破裂的现象。
PFA的其他成型方法还有传递成型、粉末涂层、分散液浸渍成型、吹塑成型和真空成型等,与FEP的成型方法类似。
关于我们
深圳市丹凯科技有限公司,专业从事FEP、PFA、PTFE等氟塑料管棒板膜制品以及其他绝缘材料的研发、生产、销售和服务的制造企业。
ShenZhen DanKai Technology Co.,ltd. is an intelligent manufacturing enterprise specializing in the R & D, production, sales and service of FEP, PFA, PTFE and other fluoroplastic tube, bar, sheet and film products as well as other insulating materials.
公司拥有国际标准的资深研发团队和国外引进的氟塑料制品生产线,部分氟塑料制品通过ISO9001、SGS、FDA认证。
主要产品有:①氟塑料管类:Ptfe聚四氟乙烯管,Fep管,Pfa管,Pvdf管;②热缩管类:Ptfe热缩管,Fep热缩管,Pfa热缩管,Pvdf热缩管;③板棒膜类:Ptfe板棒膜,Fep板棒膜,Pfa板棒膜,Pvdf板棒膜;④绝缘材料类:硅胶、PE、PVC、UPE等;⑤特殊类:PFA进口接头,螺旋管,弹簧管,旋切管,焊条,三通,直通,垫片,接头,锥棒,扩口管,封口管,编织管,波纹管等。同时可应客户要求定制加工生产各种规格的氟塑料产品。
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04-08
PFA-Water Pipe-Pneumatic-Waterproof-Cable Fixation-External Teeth Elbow-High Temperature Resistant Elbow
PFA accessories are the use of PFA plasticity, corrosion resistance (especially concentrated sulfuric acid, concentrated hydrochloric acid, concentrated nitric acid), wear resistance, high and low temperature resistance (-200 --- 260 degrees), aging resistance, bending resistance, after lathe processing or molding, with good sealing characteristics, performance is significantly higher than other plastic accessories.